Did You Know...
...that several people are credited with the invention of the flush toilet? Most people have heard of Thomas Crapper (1837-1910), the sanitary engineer who invented the valve-and-siphon arrangement that made the modern toilet possible. Another claimant to "the throne" was British inventor Alexander Cumming who patented a toilet in 1775. Then there's a nameless Minoan (a native of ancient Crete) who lived 4,000 years ago who supposedly was ahead of his time and created the first flush toilet!
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| Number | Title | Issue Date |
| 8391471 | Echo suppressing apparatus, echo suppressing system, echo suppressing method and recording medium An echo suppressing apparatus operable with a sound output device for outputting sound based on a reference signal and a sound processing device for processing an observed signal based on a received sound, the echo suppressing apparatus includes: an echo removal sec... | 03/05/2013 |
| 8369511 | Robust method of echo suppressor This invention proposed an Echo Suppressor which can efficiently suppress both echoes and background noise without introducing “choppiness”. The Echo Suppressor System includes said two adaptive gains Gr(RSR) and Gn(NSR), said one adaptive ... | 02/05/2013 |
| 8325909 | Acoustic echo suppression Sound signals captured by a microphone are adjusted to provide improved sound quality. More particularly, an Acoustic Echo Reduction system which performs a first stage of echo reduction (e.g., acoustic echo cancellation) on a received signal is configured to perfor... | 12/04/2012 |
| 8320553 | Enhanced echo cancellation The present invention provides for echo cancellation circuitry and variable rate encoding circuitry to cooperate with one another to effectively provide comfort noise in an effective and efficient manner. The echo cancellation circuitry will use far-end signals to g... | 11/27/2012 |
| 8306214 | Method and system for clear signal capture A method and system for clear signal capture comprehend several individual aspects that address specific problems in improved ways. In addition, the method and system also comprehend a hands-free implementation that is a practical solution to a very complex problem.... | 11/06/2012 |
| 8300801 | System and method for telephone based noise cancellation A system and method for enhancing communications through a phone. A voice communication is received from a user of the phone. A secondary signal is received from an environment in proximity to the phone. The secondary signal is processed to determine an inverse sign... | 10/30/2012 |
| 8295474 | Echo canceller with heavy double-talk estimation In a data processing system, a method includes receiving samples of a send path input signal (Sin) and samples of a receive path input signal (Rin); in response to receiving each sample of the send path input signal, providing a double-talk indicator to indicate whe... | 10/23/2012 |
| 8208621 | Systems and methods for acoustic echo cancellation Acoustic echo cancellation methods are provided, in which first and second suppression gains of first and second sub-bands of an Nth acoustic frame are generated, and the second suppression gain of the second sub-band of the Nth acoustic frame ... | 06/26/2012 |
| 8194850 | Method and apparatus for voice communication A voice communication device with an integrated framework structure for echo cancellation and noise reduction is disclosed. A microphone receives a local input signal while a speaker is outputting a local output signal. The local input signal and output signal are a... | 06/05/2012 |
| 8155302 | Acoustic echo canceller An acoustic echo cancellation device for canceling an echo in a microphone signal in response to first and second input signals includes a first combination unit for combining the first and second input signals into an aggregate input signal. The device further incl... | 04/10/2012 |
| 7856097 | Echo canceling apparatus, telephone set using the same, and echo canceling method Providing echo canceling apparatus, telephone set using the same and an echo canceling method that do not require transmission/reception sound detection and are resistant to environmental noise. Echo canceling apparatus according to the invention includes a c... | 12/21/2010 |
| 7734035 | Method and apparatus for soft-response echo suppression Methods and apparatus are provided for reducing echo from a received signal. A suppression gain is applied to an output of an echo canceler that has processed the received signal. The suppression gain includes a region of sloping attenuation about a decision point. ... | 06/08/2010 |
| 7711107 | Perceptual masking of residual echo A method of masking a residual echo signal by an echo canceller is provided. The method comprises receiving a far-end signal, adjusting filter coefficients of an adaptive filter in response to the far-end signal, generating an echo model signal based on the far-end ... | 05/04/2010 |
| 7450714 | Echo canceller having improved non-linear processor A non-linear processor for use in an echo canceller is set forth. The non-linear processor includes a center clipping digital filter receiving an echo compensated signal. The non-linear processor provides a center clipped output signal having non-linear thresholds a... | 11/11/2008 |
| 7433463 | Echo cancellation and noise reduction method A method and system for clear signal capture comprehend several individual aspects that address specific problems in improved ways. In addition, the method and system also comprehend a hands-free implementation that is a practical solution to a very complex problem.... | 10/07/2008 |
| 7394898 | Echo removing apparatus An echo removing apparatus for reducing the echo caused by sound returning from a speaker to a microphone of a small-sized communication terminal, such as a portable telephone. The echo removing apparatus includes a filter unit for outputting a pseudo echo signal es... | 07/01/2008 |
| 7366245 | Calibration in MIMO systems Aggregate channel reciprocity in a wireless system is supported by calibrating transmitter/receiver pairs. ... | 04/29/2008 |
| 7366118 | Echo cancellation The present invention relates to a cancellation of echoes in telecommunications systems, more specifically it relates to adaptive alignment of a linear filter (500) used for echo cancellation. According to the invention, it is continuously determined, by mean... | 04/29/2008 |
| 7352687 | Mixed domain cancellation A method and apparatus for reducing crosstalk in a multi-channel communication system is disclosed. In one embodiment, outgoing signals in a multi-channel environment are manipulated into a transform domain, such as the frequency domain. Thereafter, the signals may ... | 04/01/2008 |
| 7349482 | Echo canceller of ADSL system and training method thereof An echo cancellation circuit includes delay units at its input unit and output unit in order to adjust the delay caused by a FIFO. The delay times of the delay units are trained using a training signal, such the REVERB signal, that is a system initializing signal. I... | 03/25/2008 |
| 7346013 | Frequency domain equalization of communication signals A system and method for estimating a channel spectrum. The method includes: (a) receiving an input signal from a channel, where the input signal includes one or more major echoes and zero or more minor echoes introduced by the channel; (b) identifying the one or mor... | 03/18/2008 |
| 7346012 | Transceiver with accelerated echo canceller convergence A receiver for receiving an incoming signal over a communication medium includes an echo canceller, which is adapted to receive an outgoing signal transmitted over the communication medium, and to process the outgoing signal using a set of variable processing coeffi... | 03/18/2008 |
| 7333603 | System and method for adapting an analog echo canceller in a transceiver front end There is disclosed an echo canceller circuit for use in a full duplex transceiver of the type comprising a line driver capable of sending analog transmit signals through a cable and comprising a line receiver capable of receiving analog receive signals from the cabl... | 02/19/2008 |
| 7330500 | Adjustable electronic duplexer A duplexer for a communication device having a transmission unit, a reception unit and a shared antenna is disclosed. The duplexer comprises a first signal path between the transmission unit and the reception unit, the first signal path comprises a filter unit filte... | 02/12/2008 |
| 7327840 | Loudspeaker telephone equalization method and equalizer for loudspeaker telephone An equalizer for a loudspeaker telephone includes a signal generator for generating a reference signal for broadcast by a loudspeaker of the loudspeaker telephone. A filter alters the frequency response of signals prior to broadcast by the loudspeaker. During set-up... | 02/05/2008 |
| 7319748 | Device and method for suppressing echo in telephones The present invention relates to a suppression device for an arrangement for the transmission of audio signals, in particular uttered speech, having: an echo reduction unit (4), which is arranged between an input channel (1) for receiving an input audi... | 01/15/2008 |
| 7319846 | Colored interference identification A method and apparatus for receiving a communication signal r(t) subject to noise n(t) over a communication channel (10) is disclosed. The method comprises the steps of: receiving (100) the communication signal r(t) comprising the noise n(t), estimatin... | 01/15/2008 |
| 7317801 | Active acoustic noise reduction system An active acoustic noise reduction system which comprises a single input transducer and an output actuator that are physically located next to each other in the same location. In one embodiment, the input transducer and the output actuator are a hybrid represented b... | 01/08/2008 |
| 7305083 | Echo canceller An echo canceller used in a vocal information exchange system operates in such a circumstance that a sound wave released by a speaker is picked up by a microphone unintentionally and works to suppress an echo signal included in the audio signal produced by the micro... | 12/04/2007 |
| 7305216 | Transmitting and receiving arrangement with interference signal suppression control A transmitting and receiving arrangement is disclosed having a transmission path, a reception path, and a control device for suppression of interference signals which are produced by crosstalk from the transmission path to the reception path. The control device inpu... | 12/04/2007 |
| 7289626 | Enhancement of sound quality for computer telephony systems Techniques for enhancing the sound quality of computer telephony systems are provided. In general, digital signals including telephony sounds are converted from the time domain to the frequency domain. If noise is detected in the frequency domain conversion of the d... | 10/30/2007 |
| 7283543 | System and method for operating echo cancellers with networks having insufficient levels of echo return loss A system and method for providing an apparent echo return loss is provided. A communications network may include a gateway coupled to a local exchange network. The gateway may receive signals from a packet network and output signals to a circuit switched network, wh... | 10/16/2007 |
| 7274732 | Echo cancellation in communication systems with asymmetric data rates A communication device (e.g., a modem) is disclosed as including logic that processes a transmit signal before providing a signal to an echo canceler. The processing may include low pass filtering and decimation of the transmit signal. The low pass filter's cut-off ... | 09/25/2007 |
| 7269211 | Residual echo reduction for a full duplex transceiver A hybrid circuit within a full-duplex transceiver transmits an outgoing signal outward on a communication channel at the same time it receives an incoming signal arriving via the communication channel, and the outgoing and incoming signals sum to form a combined sig... | 09/11/2007 |
| 7260213 | Telephone echo canceller The invention relates to an echo canceling device and method for an arrangement for transmitting audio signals, in particular uttered speech with an echo filter for canceling echo. The echo filter is arranged between an input channel (1) and an output channel... | 08/21/2007 |
| 7251213 | Method for remote measurement of echo path delay A method of measuring echo path delay in a circuit having echo cancellers after enabling an echo signal to pass through the echo cancellers. The known time for a given echo canceller to disable is subtracted from the overall test signal duration. This quantity can b... | 07/31/2007 |
| 7246059 | Method for fast dynamic estimation of background noise The invention provides a method and system for dynamically estimating background noise. The system includes a portable communication device, a vocoder, and a voice activated detector. Based on information received by the portable communication device, the vocoder de... | 07/17/2007 |
| 7243065 | Low-complexity comfort noise generator A comfort noise generator (104) suitable for use in a communication system includes a finite impulse response (FIR) filter (136), a random number generator (140), and a coefficient updater (138). The coefficient updater (138) deter... | 07/10/2007 |
| 7233896 | Regular-pulse excitation speech coder A method for providing synthesized speech using regular-pulse excitation includes a first step (300) of processing input speech to provide a residual excitation signal. A next step (302) includes defining important samples of the residual signal. Low f... | 06/19/2007 |
| 7233893 | Method and apparatus for transmitting wideband speech signals A method and an apparatus for transmitting a speech signal are provided. A speech signal transmitter includes a quadrature mirror filter, a base sub-band encoder, an enhancement sub-band encoder, and a network connector. The quadrature mirror filter receives a speec... | 06/19/2007 |
